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<?php $a = array( array('id' => 3, 'a' => 33), array('id' => 5, 'a' => 55), array('id' => 7, 'b' => 256), array('id' => '', 'a'=> 512), ); var_dump(array_column($a, null, 'id'));
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [3]=> array(2) { ["id"]=> int(3) ["a"]=> int(33) } [5]=> array(2) { ["id"]=> int(5) ["a"]=> int(55) } [7]=> array(2) { ["id"]=> int(7) ["b"]=> int(256) } [""]=> array(2) { ["id"]=> string(0) "" ["a"]=> int(512) } }

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